Rights and service quality
The EU 1107/2006 Regulation (applicable to all EU airports) grants full accessibility to air travel without any discrimination nor additional costs for disabled passengers or passengers with a reduced mobility.
No one can refuse your booking or boarding on the basis of your disability or reduced mobility. The only exception applies to potential safety related problems connected to national or international regulations or technical impediments, for instance concerning the size of the aircraft.
For flights within the EU, if no technical issue prevents it, and provided that a prior 48-hour notification was made, airlines must carry medical equipments and 2 mobility aids, such as wheelchairs or crutches, without any additional charges.